Electronic cigarette



FIG. 1 is a front elevation view of an electronic cigarette;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left-side elevation view thereof;

FIG. 6 is a right-side elevation view thereof; and,

FIG. 7 is a perspective view thereof.

The portions of the article shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for an electronic cigarette, as shown and described. 